Tugas 3 OTK 1

Tugas 3 mata kuliah OTK 1

tugas dikumpulkan besok Senin, 24 Oktober 2011

Soal pertama

A disk-type filter handles petroleum residue settlings. A series of tests run at constant rate of 0.1 gpm yielded the following data :

Pressure differential (psi)            32           67           162

Total volume filtered (gal)            1              2              3

1. It is proposed that this filter be operated at a constant pressure differential of 50 psi. If the sludge is homogeneous, calculate the volume of oil filtered in 30 min under such conditions.
2. Calculate the filtering time if the press were operated at constant rate until the pressure differential became 50 psi, and the at constant-pressure differential until 20 gal of oil were forced through the press

Soal kedua

A leaf filter press with 10 ft² of filtering area operating at a constant pressure difference of 40 psig gave the following results :

Filtrate volume (cuft)     141         215         270         340         400

Time (min)                          10           20           30           45           60

The original slurry contained 10% wt of solid CaCO₃  in the water.

1. Determine the time required to wash the cake formed at the end of 70 min of filtering at the same pressure using 100 cuft of wash water
2. If the time for dumping and reassembling the press is 1 hr what is the optimum time in hours for the filtration cycle at the constant pressure difference of 40 psig. Assume wash water is used in the same proportion to the final filtrate as in (a). What is the volume of filtrate obtained per cycle.